I think this could also be a problem of your mail programme. I have already seen my mail programme (Google mail) transforming special characters to "=" plus their hexadecimal Ascii value when I click on "view source". So ?
Though, I have never had a problem with links.
(you can try these characters out with Wikipedia, enter the codes with % instead of = -> http://en.wikipedia.org/wiki/%3D
-> you get the article of the equal sign)
liyp-apohtec s lpahlet iw